A control strategy was put forward based on BP neural network in the research of electro-hydraulic position servo control system by the assist of traditional PID control,to implement the PID parameters self-tuning of electro hydraulic position servo system, for neural network had the characteristics of self-adaption and self-learning. Through building the testing machine and conducting the experiment, the results show that the BP neural network PID control is a very practical control strategy for its well solution of the electro-hydraulic servo control system's problems in loading speed and stability.